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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ORC_TYPES_H
#define _ORC_TYPES_H
#include <linux/types.h>
/*
* The ORC_REG_* registers are base registers which are used to find other
* registers on the stack.
*
* ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
* address of the previous frame: the caller's SP before it called the current
* function.
*
* ORC_REG_UNDEFINED means the corresponding register's value didn't change in
* the current frame.
*
* The most commonly used base registers are SP and FP -- which the previous SP
* is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
* usually based on.
*
* The rest of the base registers are needed for special cases like entry code
* and GCC realigned stacks.
*/
#define ORC_REG_UNDEFINED 0
#define ORC_REG_PREV_SP 1
#define ORC_REG_SP 2
#define ORC_REG_FP 3
#define ORC_REG_MAX 4
#define ORC_TYPE_UNDEFINED 0
#define ORC_TYPE_END_OF_STACK 1
#define ORC_TYPE_CALL 2
#define ORC_TYPE_REGS 3
#define ORC_TYPE_REGS_PARTIAL 4
#ifndef __ASSEMBLY__
/*
* This struct is more or less a vastly simplified version of the DWARF Call
* Frame Information standard. It contains only the necessary parts of DWARF
* CFI, simplified for ease of access by the in-kernel unwinder. It tells the
* unwinder how to find the previous SP and FP (and sometimes entry regs) on
* the stack for a given code address. Each instance of the struct corresponds
* to one or more code locations.
*/
struct orc_entry {
s16 sp_offset;
s16 fp_offset;
s16 ra_offset;
unsigned int sp_reg:4;
unsigned int fp_reg:4;
unsigned int ra_reg:4;
unsigned int type:3;
unsigned int signal:1;
};
#endif /* __ASSEMBLY__ */
#endif /* _ORC_TYPES_H */
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